Search found 20 matches
- Sat Dec 08, 2018 7:59 pm
- Forum: Trends in The Periodic Table
- Topic: electron affinity
- Replies: 2
- Views: 18
Re: electron affinity
Electron Affinity is the energy change when a neutral atom attracts an electron to become a negative ion. So yes you are, in a way, correct
- Sun Nov 11, 2018 11:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar Covalent Bonds
- Replies: 2
- Views: 23
Re: Polar Covalent Bonds
Yes, it would not be covalent anymore it would be ionic. The guidelines are: If the electronegativity difference is greater than 2 then it is an ionic bond. If the electronegativity difference is less than 1.5 then it would be a covalent bond. If the difference is between 1.5 and 2 then it would be ...
- Sun Nov 11, 2018 11:15 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 22
Re: Bond Angles
Tetrahedrals are 3D shapes, not 2D. If they were 2D shapes then the angles would be 90 degrees. Remember that the shapes of molecules should be in 3D since we live in a 3D world
- Sun Nov 11, 2018 11:07 pm
- Forum: Properties of Light
- Topic: Test 3
- Replies: 24
- Views: 315
Re: Test 3
He has not told us what will be on the test yet but I'm guessing it's going to be on everything we learned after the midterm
- Sun Nov 11, 2018 11:02 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 7023
- Views: 772147
Re: Post All Chemistry Jokes Here
What do you do to a dead chemist?
You barium
You barium
- Sun Nov 11, 2018 10:31 pm
- Forum: Einstein Equation
- Topic: Kinetic Energy and Moles
- Replies: 1
- Views: 57
Re: Kinetic Energy and Moles
Remember that in the equation E=hv, E is the energy of only one photon...in this case photons are equivalent to particles so you would have to find out how many particles are in 5 mol of the substance and multiply that by the answer you got....that way you calculated the amount of energy ejected by ...
- Sun Nov 11, 2018 10:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: Hydrogen bond
- Replies: 3
- Views: 20
Re: Hydrogen bond
Stemming from what the person above said, hydrogen bonds are intermolecular not intramolecar...They are also make the strongest bonds
- Sun Nov 11, 2018 12:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent vs Hydrogen bond in H20
- Replies: 4
- Views: 33
Re: Covalent vs Hydrogen bond in H20
Covalent bonds are for intramolecular bonds while hydrogen bonds are for intermolecular bonds. in simpler terms, a covalent bond is what actually glues the H2 and O atoms to make a molecule while the hydrogen bond glues the H2O molecule with other H2O molecules to make water.
- Sun Nov 11, 2018 12:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 4
- Views: 36
Re: Molecular Shape
The type of atom does not affect the shape, the number of atoms do. Remember that the shape has to be a 3D shape not 2D because we live in a 3D world. Hope this helps :)
- Sun Nov 11, 2018 11:41 am
- Forum: Bond Lengths & Energies
- Topic: Strength of Bonds
- Replies: 9
- Views: 108
Re: Strength of Bonds
Stemming from what the last post said, if you were to melt ice, it is still H2O so the intramolecular molecules are not affected. The state of the H20 is affected though...that shows a change in intermolecular forces.
- Fri Oct 26, 2018 12:25 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 3
- Views: 61
Re: Drawing Lewis Structures
Here's a video on the basics of Lewis structures: https://www.youtube.com/watch?v=1ZlnzyHahvo
I hope this helps :)
I hope this helps :)
- Fri Oct 26, 2018 12:23 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d and 4s
- Replies: 2
- Views: 34
Re: 3d and 4s
I think the reason why is because the periodic table was created before orbitals were even discovered. The periodic table is organized in such a way that elements are grouped with other elements because of how similar in reactivity they are (ex: alkaline metals, noble gases, etc.). If you need more ...
- Fri Oct 26, 2018 12:13 pm
- Forum: Lewis Structures
- Topic: writing the structure
- Replies: 5
- Views: 32
Re: writing the structure
Are you talking about Lewis structures? If so here's a video: https://www.youtube.com/watch?v=1ZlnzyHahvo
I hope this helps :)
I hope this helps :)
- Fri Oct 19, 2018 5:50 pm
- Forum: *Black Body Radiation
- Topic: Test
- Replies: 9
- Views: 185
Re: Test
Do we at least have to know what it's about? Or will the test just be all math?
- Fri Oct 19, 2018 5:45 pm
- Forum: DeBroglie Equation
- Topic: wave property
- Replies: 4
- Views: 43
Re: wave property
What do you mean by resting mass?
- Fri Oct 19, 2018 5:38 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum number song
- Replies: 1
- Views: 25
- Fri Oct 19, 2018 5:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 23781
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Is this going to be similar to the test next week?? Also what specific concepts do we not need to know other than Schrodinger's equation?
- Fri Oct 05, 2018 11:23 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 86
- Views: 25205
Re: Advice from a Medical Student [ENDORSED]
I was just wondering how did you prepare/study for the MCAT and get into medical school in general? I'm very interested in hearing your journey! But overall thank you so much for the, it was extremely helpful :)
- Fri Oct 05, 2018 11:17 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 113
- Views: 33156
Re: Rusty on High School Chem [ENDORSED]
I took chemistry in sophomore year of high school, but it was mainly a worksheet type class more based on completion than anything else, so I'm pretty rusty as well. I've attended the Peer Learning Facilities with the UAs though and that really seems to help as you can ask any questions you want an...
- Fri Oct 05, 2018 10:13 am
- Forum: Limiting Reactant Calculations
- Topic: When to use H vs H2
- Replies: 7
- Views: 94
Re: When to use H vs H2
I also have a question: when you have a reaction in the form of MgSO4.7H2O where the 7 is in front of the H2O, would you have to do 7x(molar mass of H2) + the molar mass of O or 7x(the molar mass of H20)?